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19/12
|-2 -1 0 0 0 0 0 1>
795.558 cents
sound sample

19/12 is a 19-limit interval, about 795.6 cents in size, that is very close to the minor sixth of 12edo (800 cents). Interestingly, 19/12 * 19/15 = 361/180 (1204.8 cents), which is very close to an octave.